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        2020年奥运会将在哪里举行？<br />
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            onselectedindexchanged="RadioButtonList1_SelectedIndexChanged">
            <asp:ListItem Value="0">A.中国</asp:ListItem>
            <asp:ListItem Value="1">B.美国</asp:ListItem>
            <asp:ListItem Value="2">C.日本</asp:ListItem>
            <asp:ListItem Value="3">D.巴西</asp:ListItem>
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